RTC in local TZ: no 表示 RTC 时钟不是用本地时间，而是使用 UTC 时间，可以改成使用本地时间，但是并不推荐这么做：

$ timedatectl set-local-rtc 1
$ timedatectl
Local time: Thu 2018-09-20 03:57:58 CEST
Universal time: Thu 2018-09-20 01:57:58 UTC
RTC time: Thu 2018-09-20 03:57:59
Time zone: Europe/Paris (CEST, +0200)
Network time on: yes
NTP synchronized: yes
RTC in local TZ: yes
Warning: The system is configured to read the RTC time in the localtime zone.
This mode can not be fully supported. It will create various problems
with time zone changes and daylight saving time adjustments. The RTC
time is never updated, it relies on external facilities to maintain it.
If at all possible, use RTC in UTC by calling
'timedatectl set-local-rtc 0'.